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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Financial Instruments And Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities The tables below summarize the balances of derivative assets and liabilities at September 30, 2018 and December 31, 2017 (in thousands):
 
September 30, 2018
 
Level 1
 
Level 2
 
Level 3
 
Netting (1)
 
Total - Net
Assets:
 
 
 
 
 
 
 
 
 
Commodity derivatives (2)
$
99

 
$
—

 
$
—

 
$
(99
)
 
$
—

Interest rate swaps
—

 
—

 
154

 
—

 
154

Total assets
99

 
—

 
154

 
(99
)
 
154

Liabilities:
 
 
 
 
 
 
 
 
 
Commodity derivatives
3,242

 
—

 
—

 
(99
)
 
3,143

Foreign currency forwards
—

 
1,037

 
—

 
—

 
1,037

Total liabilities
3,242

 
1,037

 
—

 
(99
)
 
4,180

Net assets (liabilities) at fair value
$
(3,143
)
 
$
(1,037
)
 
$
154

 
$
—

 
$
(4,026
)
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Netting (1)
 
Total - Net
Assets:
 
 
 
 
 
 
 
 
 
Commodity derivatives (2)
$
602

 
$
—

 
$
—

 
$
(602
)
 
$
—

Foreign currency forwards
—

 
2,564

 
—

 
—

 
2,564

Total assets
602

 
2,564

 
—

 
(602
)
 
2,564

Liabilities:


 


 


 


 


Commodity derivatives
1,970

 
—

 
—

 
(602
)
 
1,368

Interest rate swaps
—

 
—

 
1,228

 
—

 
1,228

Total liabilities
1,970

 
—

 
1,228

 
(602
)
 
2,596

Net assets (liabilities) at fair value
$
(1,368
)
 
$
2,564

 
$
(1,228
)
 
$
—

 
$
(32
)
(1) Relates primarily to exchange traded futures. Gain and loss positions on multiple contracts are settled net on a daily basis with the exchange.
(2) Commodity derivatives are subject to netting arrangements.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] The following table summarizes changes in the fair value of our net financial liabilities classified as Level 3 in the fair value hierarchy (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Net assets (liabilities) at beginning of the period
$
110

 
$
—

 
$
(1,228
)

$
—

Interest rate swaps acquired through acquisition
—

 
(3,275
)
 
—

 
(3,275
)
Transfers out of Level 3
—

 
—

 
—


—

Realized/Unrealized gain included in earnings*
268

 
618

 
1,487


618

Settlements
(224
)
 
—

 
(105
)

—

Net assets (liabilities) at end of period
$
154

 
$
(2,657
)
 
$
154


$
(2,657
)
*Gains and losses related to interest rate swaps are recorded in interest expense in the condensed consolidated statements of operations and comprehensive income (loss).
Schedule of Notional Quantities for Commodity Derivative Instruments The following table sets forth the notional quantities for derivative instruments entered into (in thousands of barrels):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Sales
2,704

 
3,386

 
10,467

 
9,980

Purchases
2,701

 
2,820

 
9,892

 
9,772
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] We have recorded the fair value of our commodity derivative instruments on our condensed consolidated balance sheets in “other current assets” and “other current liabilities” in the following amounts (in thousands):
 
September 30, 2018
 
December 31, 2017
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Commodity contracts
$
—

 
$
3,143

 
$
—

 
$
1,368
Schedule of Realized and Unrealized Gains (Losses) from Commodity Derivatives Realized and unrealized gains (losses) from our commodity derivatives were recorded to product revenue in the following amounts (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Commodity contracts
$
(1,247
)
 
$
(3,987
)
 
$
(13,477
)
 
$
4,886